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<b>let </b><font color="Maroon">C</font> be  <a href="topreal2.html#V1">being_simple_closed_curve</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> 2</span>)</span>;<br/><b>let </b><font color="Maroon">D</font> be   <a href="topreal2.html#NM1">Simple_closed_curve</a>;<br/>



<b>reconsider </b><font color="Maroon">A</font> = <font color="Maroon">C</font> as  <a href="tbsp_1.html#V6">bounded</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span> <b>by </b><i><a class="ref" href="jordan2c.html#D2">JORDAN2C:def 2</a></i>;<br/>
<b>consider </b><font color="Maroon">r1</font> being   <a href="real_1.html#NM1">Real</a>, <font color="Maroon">x1</font> being   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span><b> such that </b><br/><a NAME="E3:17"/>
0 <a href="xxreal_0.html#R1">&lt;</a> <font color="Maroon">r1</font>
 <b>and </b><br/><a NAME="E4:17"/><i><font color="Green">E43</font></i>: 
<font color="Maroon">A</font> <a href="tarski.html#R1">c=</a>  <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font>
 <b>by </b><i><a class="ref" href="metric_6.html#D10">METRIC_6:def 10</a></i>;<br/>
<b>reconsider </b><font color="Maroon">B</font> = <font color="Maroon">D</font> as  <a href="tbsp_1.html#V6">bounded</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span> <b>by </b><i><a class="ref" href="jordan2c.html#D2">JORDAN2C:def 2</a></i>;<br/>
<b>consider </b><font color="Maroon">r2</font> being   <a href="real_1.html#NM1">Real</a>, <font color="Maroon">x2</font> being   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span><b> such that </b><br/><a NAME="E7:17"/>
0 <a href="xxreal_0.html#R1">&lt;</a> <font color="Maroon">r2</font>
 <b>and </b><br/><a NAME="E8:17"/><i><font color="Green">E44</font></i>: 
<font color="Maroon">B</font> <a href="tarski.html#R1">c=</a>  <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font>
 <b>by </b><i><a class="ref" href="metric_6.html#D10">METRIC_6:def 10</a></i>;<br/>
<b>consider </b><font color="Maroon">x3</font> being   <a href="pre_topc.html#NM2">Point</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span>, <font color="Maroon">r3</font> being   <a href="real_1.html#NM1">Real</a><b> such that </b><br/><a NAME="E10:17"/><i><font color="Green">E45</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="tarski.html#R1">c=</a>  <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font>
 <b>by </b><i><a class="ref" href="weierstr.html#T1">WEIERSTR:1</a></i>;<br/>
<a NAME="E11:17"/>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K4">\/</a> <span class="p2">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span></span>)</span> <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i>, <a class="ref" href="subset_1.html#T31">SUBSET_1:31</a></i>;<br/>
<a NAME="E12:17"/><b>then </b><i><font color="Green">E46</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K3">`</a> </span>)</span> <a href="subset_1.html#K9">/\</a> <span class="p1">(<span class="default"><span class="p2">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="subset_1.html#K3">`</a> </span>)</span>
 
<b>by </b><i><a class="ref" href="xboole_1.html#T53">XBOOLE_1:53</a></i>;<br/>
<a NAME="E13:17"/><b>then </b><i><font color="Green">E47</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i><a class="ref" href="xboole_1.html#T18">XBOOLE_1:18</a></i>;<br/>
<a NAME="E14:17"/><i><font color="Green">E48</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i>, <a class="ref" href="xboole_1.html#T18">XBOOLE_1:18</a></i>;<br/>
<b>reconsider </b><font color="Maroon">C'</font> = <span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K3">`</a> , <font color="Maroon">D'</font> = <span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="subset_1.html#K3">`</a>  as  <a href="connsp_1.html#V2">connected</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K15">TOP-REAL</a> 2</span>)</span> <b>by </b><i><a class="ref" href="jordan1k.html#T37">JORDAN1K:37</a></i>;<br/>
<a NAME="E16:17"/><i><font color="Green">E49</font></i>: 
 <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font> is <a href="tbsp_1.html#V6">bounded</a>
 
<b>by </b><i><a class="ref" href="tbsp_1.html#T19">TBSP_1:19</a></i>;<br/>
<div><i><font color="Green">E50</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="17_1"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:17_1"/>
<font color="Maroon">C'</font> is <a href="jordan2c.html#V1">Bounded</a>
 ;<br/><a NAME="E2:17_1"/><b>then </b>
<font color="Maroon">C'</font> is  <a href="tbsp_1.html#V6">bounded</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span>
 <b>by </b><i><a class="ref" href="jordan2c.html#D2">JORDAN2C:def 2</a></i>;<br/><b>hence </b><a NAME="E3:17_1"/>
contradiction
 <b>by </b><i>, <a class="ref" href="jordan1k.html#T8">JORDAN1K:8</a></i>;<br/></div><b>end;</b></div>
<a NAME="E18:17"/>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">A</font> <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i>, <a class="ref" href="subset_1.html#T31">SUBSET_1:31</a></i>;<br/>
<a NAME="E19:17"/><b>then </b>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x1</font>,<font color="Maroon">r1</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="xboole_0.html#R1">misses</a> <font color="Maroon">A</font>
 
<b>by </b><i><a class="ref" href="subset_1.html#T43">SUBSET_1:43</a></i>;<br/>
<a NAME="E20:17"/><b>then </b>
<font color="Maroon">C'</font> <a href="tarski.html#R1">c=</a>  <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">C</font>
 
<b>by </b><i>, <a class="ref" href="jordan2c.html#T133">JORDAN2C:133</a></i>;<br/>
<a NAME="E21:17"/><b>then </b><i><font color="Green">E54</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a>  <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">C</font>
 
<b>by </b><i>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E22:17"/><i><font color="Green">E55</font></i>: 
 <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font> is <a href="tbsp_1.html#V6">bounded</a>
 
<b>by </b><i><a class="ref" href="tbsp_1.html#T19">TBSP_1:19</a></i>;<br/>
<div><i><font color="Green">E56</font></i>: <a class="txt" onclick="hs2(this)" href="javascript:()" title="17_2"><b>now </b></a><div class="add"><b>assume </b><a NAME="E1:17_2"/>
<font color="Maroon">D'</font> is <a href="jordan2c.html#V1">Bounded</a>
 ;<br/><a NAME="E2:17_2"/><b>then </b>
<font color="Maroon">D'</font> is  <a href="tbsp_1.html#V6">bounded</a> <a href="struct_0.html#NM2">Subset</a> of <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span>
 <b>by </b><i><a class="ref" href="jordan2c.html#D2">JORDAN2C:def 2</a></i>;<br/><b>hence </b><a NAME="E3:17_2"/>
contradiction
 <b>by </b><i>, <a class="ref" href="jordan1k.html#T8">JORDAN1K:8</a></i>;<br/></div><b>end;</b></div>
<a NAME="E24:17"/>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a> <font color="Maroon">B</font> <a href="subset_1.html#K3">`</a> 
 
<b>by </b><i>, <a class="ref" href="subset_1.html#T31">SUBSET_1:31</a></i>;<br/>
<a NAME="E25:17"/><b>then </b>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x2</font>,<font color="Maroon">r2</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="xboole_0.html#R1">misses</a> <font color="Maroon">B</font>
 
<b>by </b><i><a class="ref" href="subset_1.html#T43">SUBSET_1:43</a></i>;<br/>
<a NAME="E26:17"/><b>then </b>
<font color="Maroon">D'</font> <a href="tarski.html#R1">c=</a>  <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">D</font>
 
<b>by </b><i>, <a class="ref" href="jordan2c.html#T133">JORDAN2C:133</a></i>;<br/>
<a NAME="E27:17"/><b>then </b><i><font color="Green">E57</font></i>: 
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="tarski.html#R1">c=</a>  <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">D</font>
 
<b>by </b><i>, <a class="ref" href="xboole_1.html#T1">XBOOLE_1:1</a></i>;<br/>
<a NAME="E28:17"/>
 <a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font> is <a href="tbsp_1.html#V6">bounded</a>
 
<b>by </b><i><a class="ref" href="tbsp_1.html#T19">TBSP_1:19</a></i>;<br/>
<a NAME="E29:17"/><b>then </b>
<span class="p1">(<span class="default"><a href="metric_1.html#K9">Ball</a> <font color="Maroon">x3</font>,<font color="Maroon">r3</font></span>)</span> <a href="subset_1.html#K3">`</a>  <a href="hidden.html#NR2" target="_self">&lt;&gt;</a>  <a href="pre_topc.html#K1">{}</a> <span class="p1">(<span class="default"><a href="euclid.html#K14">Euclid</a> 2</span>)</span>
 
<b>by </b><i><a class="ref" href="jordan1k.html#T8">JORDAN1K:8</a></i>;<br/>
<b>hence </b><a NAME="E30:17"/>
 <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">C</font> <a href="subset_1.html#R2">meets</a>  <a href="jordan2c.html#K2">UBD</a> <font color="Maroon">D</font>
 <b>by </b><i>, , <a class="ref" href="xboole_1.html#T68">XBOOLE_1:68</a></i>;<br/>


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